package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author Psycho
 * @create 2022-04-22-21:32
 */
@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //先获取request，response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //先判断是否为登入请求，如果是就直接放行
        if(request.getURI().getPath().contains("login")){
            return chain.filter(exchange);
        }
        //如果不是登入请求
        //获取前端带来的token
        String token = request.getHeaders().getFirst("token");
        //判断token是否存在
        if(StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        Claims claimsBody = null;
        //5.判断token是否有效
        try {
            claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //获得token解析后中的用户信息
        Object userId = claimsBody.get("id");
        //在header中添加新的信息
        ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
            httpHeaders.add("userId", userId + "");
        }).build();
        //重置header
        exchange.mutate().request(serverHttpRequest).build();
        //6.放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
